Isn’t this just the flip side of the question you asked last month here http://lists.apple.com/archives/usb/2015/Jun/msg00005.html <http://lists.apple.com/archives/usb/2015/Jun/msg00005.html>
There you said you started with the VID/PID and wanted the name, so if you have that code and you used the VID/PID to find the name, then you know what the VID/PID combination was because you used it to do the search in the first place. Alternatively since you can see it in the explorer then just do what the explorer does, get the IOUSBProperties for the io_object, either all of them or the one for the vendor/product id code. If it doesn’t have one there then get its parent and look there, exactly what you’d do if you were hunting up the io registry explorer, there are properties at each level. The function for getting one property by name is in that thread, getting them all is in the same header as that function and the function for getting parents etc and walking your way up and down the tree aren’t too hard to find in the documentation. > On 9 Jul 2015, at 04:34, Carl Hoefs <[email protected]> wrote: > > Gordon, > > The devices we’re using are not the same, nor from the same vendor. One has > an assigned PID/VID, the other only has a VID (PID is 0x0). iSerialNumber for > both show 0x0 in IORegistryExplorer. > > So… what I’m hoping is either: > - To find the BSD mount point based on PID/VID, or > - To find PID/VID based on BSD mount point > > If I could do either of these, I’d be in business. As it stands, my app can > find all mount points for modem-type devices, but I have no programmatic way > to match them to a specific PID/VID. > -Carl > > >> On Jul 8, 2015, at 12:17 PM, Gordon Rankin <[email protected]> >> wrote: >> >> Carl, >> >> If the devices are identical and they do not have a unique serial number or >> something differentiating them then the mount point will not be easy to >> determine. >> >> We had this problem with USB Audio devices that had the same vid, pid and >> serial number. We are now shipping all products with unique serial numbers >> so the devices will be easier to find. >> >> Thanks, >> Gordon >> >> On 7/8/15 3:00 PM, [email protected] wrote: >>> Message: 1 >>> Date: Tue, 07 Jul 2015 16:15:51 -0700 >>> From: Carl Hoefs <[email protected]> >>> To: [email protected] >>> Subject: USB devices and BSD mount points >>> Message-ID: >>> <[email protected]> >>> Content-Type: text/plain; charset=utf-8 >>> >>> I have a Cocoa app (10.10.4) that needs to connect to two USB devices. For >>> one device, the system will assign it a BSD mount point like >>> “/dev/cu.usbmodem431”, and for the other device, “/dev/cu.usbmodem641”. >>> However, sometimes the number changes, so the 431 will be 471, or the 641 >>> will be 671, etc. >>> >>> Since the mount point is not fixed, what method can I rely on to determine >>> which device is which? Will the one device always have an enumeration in >>> the 400s, and the other in the 600s, or is this a completely arbitrary >>> number? (It seems not to be arbitrary since the one device always shows up >>> in the 400s and the other always in the 600s, but this seems like a very >>> fragile assumption.) >>> >>> -Carl >>
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